Progress in Research of Characterization Methods for Pore and Fissure Structures in Coal

Abstract

The pore and fissure of coal directly affect the occurrence and seepage of gas. Therefore, it coal seam methane should be developed for utilization and gas control. In this study, characterization methods for coal fractures are introduced on the basis of extensive literature research. They are usually divided into observation and physical test methods, and their principle and research status of each method are reviewed in detail. The application of CT three-dimensional reconstruction and fractal dimension in the physical progress of digital rock is also presented. Keywords-coal, pore and fissure, characterization method, three-dimensional reconstructionwhere ρd is the true density of dry coal, and ρp,d is the apparent density of dry coal (g/cm 3 ).(2) Nitrogen adsorption method. In this method, the amount of nitrogen adsorbed by dry degassed powders in liquid nitrogen is measured at different pressures, andThe 9th Russian-Chinese Symposium. Coal in the 21st Century: Mining, Intelligent Equipment and Environmental Protection